Modelling Maastrichtian climate: investigating the role of geography, atmospheric CO 2 and vegetation
Modelling Maastrichtian climate: investigating the role of geography, atmospheric CO 2 and vegetation
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模拟马斯特里赫特气候：研究地理、大气 CO 2 和植被的作用
DOI：
10.5194/cpd-4-981-2008
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
P. Markwick
中科院分区：
文献类型：
--
作者：
S. Hunter;P. Valdes;A. Haywood;P. Markwick
抽象的。在本文中，我们描述了一个合奏的古气候模拟的马斯特里赫特使用完全耦合的动力学海洋-大气环流模式，HadCM 3L的结果。使用适当的马斯特里赫特边界条件，我们调查的敏感性预测的古气候变化的大气CO2水平和模拟植被治疗。此外，我们探讨了气候变化的地理响应，使用与工业化前的实验比较。我们描述了我们的结果，特别是考虑到气候均衡的概念，以前的建模研究的结果。我们的研究结果表明，与工业化前的实验相比，全球气温上升了5.9°C，与1×CO2马斯特里赫特条件的变化相关，并进一步升温3.9°C，与大气CO2水平的四倍相关。与工业化前相比，我们发现一个纬度的温度分布，降低了梯度，并转移到更高的温度。我们的控制4×CO Maastrichtian实验在赤道、中纬度和高纬度分别超过工业化前的6.5-8.6°C、7.4-11.2°C和10.1-32.4°C。我们还发现了一个普遍的模式，增加热量的季节性在高纬度地区。就全球年平均温度而言，我们发现1-6×大气CO2包层的范围为18.1-23.6°C。除了在北方高纬度地区，我们发现令人满意的水平之间的协议的合奏温度包络和估计从古温度代理。纳入一个动态植被模型（TRIFFID）导致在高纬度地区的热季节性进一步增加，在中高纬度地区变暖，在低和中纬度地区降水增加。
Abstract. In this paper we describe the results from an ensemble of palaeoclimate simulations of the Maastrichtian using the fully-coupled dynamic ocean-atmosphere General Circulation Model, HadCM3L. Using appropriate Maastrichtian boundary conditions, we investigate the sensitivity of the predicted palaeoclimate to changing atmospheric CO2 levels and modelled vegetation treatment. In addition, we explore the climatic response to the changed geography using a comparison with a pre-industrial experiment. We describe our results alongside the findings of previous modelling studies in particular with consideration to concepts of climate equability. Our findings demonstrate increased global temperatures compared with the pre-industrial experiment, with a 5.9°C increase in temperatures associated with the change to 1×CO2 Maastrichtian conditions and a further 3.9°C warming associated with a quadrupling of atmospheric CO2 levels. Compared to the pre-industrial we find a latitudinal temperature profile that is reduced in gradient and shifted to higher temperatures. Our control 4×CO Maastrichtian experiment exceeds the pre-industrial by 6.5–8.6°C, 7.4–11.2°C, and 10.1–32.4°C in the equatorial, mid and high latitudes respectively. We also find a general pattern of increased thermal seasonality in the high latitudes. In terms of global mean annual temperatures we find a range of 18.1–23.6°C for our 1–6×atmospheric CO2 envelope. Other than in the northern high latitudes we find satisfactory levels of agreement between the ensemble temperature envelope and estimates from palaeotemperature proxies. The inclusion of a dynamic vegetation model (TRIFFID) leads to a further increase in the thermal seasonality at high latitudes, warming in the mid to high latitudes and increased precipitation in the low and mid latitudes.